LSQ13fn: A type II-Plateau supernova with a possibly low metallicity progenitor that breaks the standardised candle relation∗

J. Polshaw, R. Kotak, L. Dessart, M. Fraser, A. Gal-Yam, C. Inserra, S. A. Sim, S. J. Smartt, J. Sollerman, C. Baltay, D. Rabinowitz, S. Benetti, M. T. Botticella, H. Campbell, T. W. Chen, L. Galbany, R. McKinnon, M. Nicholl, K. W. Smith, M. SullivanK. Takáts, S. Valenti, D. R. Young

Resultado de la investigación: Article

8 Citas (Scopus)

Resumen

We present optical imaging and spectroscopy of supernova (SN) LSQ13fn, a type II supernova with several hitherto-unseen properties. Although it initially showed strong symmetric spectral emission features attributable to He ii, N iii, and C iii, reminiscent of some interacting SNe, it transitioned into an object that would fall more naturally under a type II-Plateau (IIP) classification. However, its spectral evolution revealed several unusual properties: metal lines appeared later than expected, were weak, and some species were conspicuous by their absence. Furthermore, the line velocities were found to be lower than expected given the plateau brightness, breaking the SN IIP standardised candle method for distance estimates. We found that, in combination with a short phase of early-time ejecta-circumstellar material interaction, metal-poor ejecta, and a large progenitor radius could reasonably account for the observed behaviour. Comparisons with synthetic model spectra of SNe IIP of a given progenitor mass would imply a progenitor star metallicity as low as 0.1 Z. LSQ13fn highlights the diversity of SNe II and the many competing physical effects that come into play towards the final stages of massive star evolution immediately preceding core-collapse.

Idioma originalEnglish
Número de artículoA1
PublicaciónAstronomy and Astrophysics
Volumen588
DOI
EstadoPublished - 1 abr 2016

Huella dactilar

metallicity
supernovae
plateaus
plateau
ejecta
spectral emission
metal
massive stars
metals
brightness
spectroscopy
stars
radii
estimates
interactions

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Citar esto

Polshaw, J. ; Kotak, R. ; Dessart, L. ; Fraser, M. ; Gal-Yam, A. ; Inserra, C. ; Sim, S. A. ; Smartt, S. J. ; Sollerman, J. ; Baltay, C. ; Rabinowitz, D. ; Benetti, S. ; Botticella, M. T. ; Campbell, H. ; Chen, T. W. ; Galbany, L. ; McKinnon, R. ; Nicholl, M. ; Smith, K. W. ; Sullivan, M. ; Takáts, K. ; Valenti, S. ; Young, D. R. / LSQ13fn : A type II-Plateau supernova with a possibly low metallicity progenitor that breaks the standardised candle relation∗. En: Astronomy and Astrophysics. 2016 ; Vol. 588.
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title = "LSQ13fn: A type II-Plateau supernova with a possibly low metallicity progenitor that breaks the standardised candle relation∗",
abstract = "We present optical imaging and spectroscopy of supernova (SN) LSQ13fn, a type II supernova with several hitherto-unseen properties. Although it initially showed strong symmetric spectral emission features attributable to He ii, N iii, and C iii, reminiscent of some interacting SNe, it transitioned into an object that would fall more naturally under a type II-Plateau (IIP) classification. However, its spectral evolution revealed several unusual properties: metal lines appeared later than expected, were weak, and some species were conspicuous by their absence. Furthermore, the line velocities were found to be lower than expected given the plateau brightness, breaking the SN IIP standardised candle method for distance estimates. We found that, in combination with a short phase of early-time ejecta-circumstellar material interaction, metal-poor ejecta, and a large progenitor radius could reasonably account for the observed behaviour. Comparisons with synthetic model spectra of SNe IIP of a given progenitor mass would imply a progenitor star metallicity as low as 0.1 Z⊙. LSQ13fn highlights the diversity of SNe II and the many competing physical effects that come into play towards the final stages of massive star evolution immediately preceding core-collapse.",
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author = "J. Polshaw and R. Kotak and L. Dessart and M. Fraser and A. Gal-Yam and C. Inserra and Sim, {S. A.} and Smartt, {S. J.} and J. Sollerman and C. Baltay and D. Rabinowitz and S. Benetti and Botticella, {M. T.} and H. Campbell and Chen, {T. W.} and L. Galbany and R. McKinnon and M. Nicholl and Smith, {K. W.} and M. Sullivan and K. Tak{\'a}ts and S. Valenti and Young, {D. R.}",
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Polshaw, J, Kotak, R, Dessart, L, Fraser, M, Gal-Yam, A, Inserra, C, Sim, SA, Smartt, SJ, Sollerman, J, Baltay, C, Rabinowitz, D, Benetti, S, Botticella, MT, Campbell, H, Chen, TW, Galbany, L, McKinnon, R, Nicholl, M, Smith, KW, Sullivan, M, Takáts, K, Valenti, S & Young, DR 2016, 'LSQ13fn: A type II-Plateau supernova with a possibly low metallicity progenitor that breaks the standardised candle relation∗', Astronomy and Astrophysics, vol. 588, A1. https://doi.org/10.1051/0004-6361/201527682

LSQ13fn : A type II-Plateau supernova with a possibly low metallicity progenitor that breaks the standardised candle relation∗. / Polshaw, J.; Kotak, R.; Dessart, L.; Fraser, M.; Gal-Yam, A.; Inserra, C.; Sim, S. A.; Smartt, S. J.; Sollerman, J.; Baltay, C.; Rabinowitz, D.; Benetti, S.; Botticella, M. T.; Campbell, H.; Chen, T. W.; Galbany, L.; McKinnon, R.; Nicholl, M.; Smith, K. W.; Sullivan, M.; Takáts, K.; Valenti, S.; Young, D. R.

En: Astronomy and Astrophysics, Vol. 588, A1, 01.04.2016.

Resultado de la investigación: Article

TY - JOUR

T1 - LSQ13fn

T2 - A type II-Plateau supernova with a possibly low metallicity progenitor that breaks the standardised candle relation∗

AU - Polshaw, J.

AU - Kotak, R.

AU - Dessart, L.

AU - Fraser, M.

AU - Gal-Yam, A.

AU - Inserra, C.

AU - Sim, S. A.

AU - Smartt, S. J.

AU - Sollerman, J.

AU - Baltay, C.

AU - Rabinowitz, D.

AU - Benetti, S.

AU - Botticella, M. T.

AU - Campbell, H.

AU - Chen, T. W.

AU - Galbany, L.

AU - McKinnon, R.

AU - Nicholl, M.

AU - Smith, K. W.

AU - Sullivan, M.

AU - Takáts, K.

AU - Valenti, S.

AU - Young, D. R.

PY - 2016/4/1

Y1 - 2016/4/1

N2 - We present optical imaging and spectroscopy of supernova (SN) LSQ13fn, a type II supernova with several hitherto-unseen properties. Although it initially showed strong symmetric spectral emission features attributable to He ii, N iii, and C iii, reminiscent of some interacting SNe, it transitioned into an object that would fall more naturally under a type II-Plateau (IIP) classification. However, its spectral evolution revealed several unusual properties: metal lines appeared later than expected, were weak, and some species were conspicuous by their absence. Furthermore, the line velocities were found to be lower than expected given the plateau brightness, breaking the SN IIP standardised candle method for distance estimates. We found that, in combination with a short phase of early-time ejecta-circumstellar material interaction, metal-poor ejecta, and a large progenitor radius could reasonably account for the observed behaviour. Comparisons with synthetic model spectra of SNe IIP of a given progenitor mass would imply a progenitor star metallicity as low as 0.1 Z⊙. LSQ13fn highlights the diversity of SNe II and the many competing physical effects that come into play towards the final stages of massive star evolution immediately preceding core-collapse.

AB - We present optical imaging and spectroscopy of supernova (SN) LSQ13fn, a type II supernova with several hitherto-unseen properties. Although it initially showed strong symmetric spectral emission features attributable to He ii, N iii, and C iii, reminiscent of some interacting SNe, it transitioned into an object that would fall more naturally under a type II-Plateau (IIP) classification. However, its spectral evolution revealed several unusual properties: metal lines appeared later than expected, were weak, and some species were conspicuous by their absence. Furthermore, the line velocities were found to be lower than expected given the plateau brightness, breaking the SN IIP standardised candle method for distance estimates. We found that, in combination with a short phase of early-time ejecta-circumstellar material interaction, metal-poor ejecta, and a large progenitor radius could reasonably account for the observed behaviour. Comparisons with synthetic model spectra of SNe IIP of a given progenitor mass would imply a progenitor star metallicity as low as 0.1 Z⊙. LSQ13fn highlights the diversity of SNe II and the many competing physical effects that come into play towards the final stages of massive star evolution immediately preceding core-collapse.

KW - Supernovae: general

KW - Supernovae: individual: LSQ13fn

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DO - 10.1051/0004-6361/201527682

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